Eric Niebler wrote:

dan marsden wrote:

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Is the used concept extensible in a way allowing for _structural_ changes of the traversed data structure? This would make it usable for tree transformations, which would be especially interesting if used with Spirit.Qi (parsing) and Spirit.Karma (generation). <snip> As for arbitrary transforms from type A to type B, this is probably

Hartmut Kaiser wrote: the biggest open question for the library (IMO).

This is the sort of thing that Proto's tree transformations handle naturally, but Proto transforms only work when the tree nodes can be differentiated at compile time. Perhaps there is some synergy between these two libraries.

I'm working on the documentation for Proto's new tree transformation framework right now. Dan, we should talk.

Yes, from what I understand of Proto, it is basically providing case analysis on the parse trees for expression template expressions. Its also nicely composable, it's that sort of case analysis type structure that I had in mind. I'd be glad to discuss whether possibly synergies between the 2 approaches. Cheers Dan __________________________________________________________ Sent from Yahoo! Mail - a smarter inbox http://uk.mail.yahoo.com